title: Evaluation and comparison of dimensional accuracy of newly introduced elastomeric impression material using 3D laser scanners: an in vitro study.
abstract: OBJECTIVE
  Aim of the present study was to comparatively evaluate dimensional accuracy of newely introduced elastomeric impression material after repeated pours at different time intervals.
  
  
  METHODS
  In the present study a total of 20 (10 + 10) impressions of master model were made from vinyl polyether silicone and vinyl polysiloxane impression material. Each impression was repeatedly poured at 1, 24 hours and 14 days. Therefore, a total of 60 casts were obtained. Casts obtained were scanned with three-dimensional (3D) laser scanner and measurements were done.
  
  
  RESULTS
  Vinyl polyether silicone produced overall undersized dies, with greatest change being 0.14% only after 14 days. Vinyl polysiloxane produced smaller dies after 1 and 24 hours and larger dies after 14 days, differing from master model by only 0.07% for the smallest die and to 0.02% for the largest die.
  
  
  CONCLUSIONS
  All the deviations measured from the master model with both the impression materials were within a clinically acceptable range.
  
  
  CONCLUSIONS
  In a typical fixed prosthodontic treatment accuracy of prosthesis is critical as it determines the success, failure and the prognosis of treatment including abutments. This is mainly dependent upon fit of prosthesis which in turn is dependent on dimensional accuracy of dies, poured from elastomeric impressions.
authors.affiliation: Department of Prosthodontics, Saraswati-Dhanwantari Dental College, Parbhani, Maharashtra, India.
authors.forename: Amrita
authors.initials: A
authors.lastname: Pandita
authors.forename: Teerthesh
authors.initials: T
authors.lastname: Jain
authors.forename: Naveen S
authors.initials: NS
authors.lastname: Yadav
authors.forename: S M A
authors.initials: SM
authors.lastname: Feroz
authors.lastname: Pradeep
authors.forename: Akankasha
authors.initials: A
authors.lastname: Diwedi
mesh_terms: D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique / Q000295:instrumentation; D020724:Elastomers / Q000737:chemistry*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007834:Lasers; D008422:Materials Testing; D003765:Models, Dental; D011145:Polyvinyls / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014753:Vinyl Compounds / Q000737:chemistry
chemical_list: D003760:Dental Impression Materials; D020724:Elastomers; D011145:Polyvinyls; D012826:Silicone Elastomers; D012833:Siloxanes; D014753:Vinyl Compounds; C034183:vinyl polysiloxane